Order number 940406-171827-13 set 5 with 102 of 102 OEFICIAL USE ONLY page 56 occurred as a result of the ingestion and inhalation of fallout material from a nuclear detonation lin the Spring of 1954. An evaluation of the nature and extent of this internal radioactive contamination was made by a comparison of the radioelements excreted by the exposed human beings with data obtained from radiochémical analysis of the tissues and excreta of animals contaminated in the same event. The body burden of the group of human beings with the greatest internal contamiation was near but did not exceed the maximum permissible levels for the individual radionuclides. Radioiodine and radiostrontium were present in highest concentrations at early times after exposure and were potentially the greatest internal hazard. The contribution of the internal radiation to the acute radiation syndrome observed appears to be small on the basis of the estimated body burden of the the principal radioelements. In view of the short half-life of the . 801. KEYWORD (S) most-abundant fission products in this situation, the possibility that chronic irradiation effects will occur is quite small. MAN/radioactive contamination ;MAN/radionuclide kinetics ;FALLOUT/uptake ;CASTLE/fallout ; ANIMALS/radiocactive contamination ;MAN; FALLOUT; UPTAKE; ATOMIC EXPLOSIONS; INHALATION; INGESTION; IODINE ISOTOPES; STRONTIUM ISOTOPES; CASTLE; ANIMALS;EXCRETION; PERSONNEL MONITORING; BODY BURDEN Item 97 150. 110. REPORT NUMBER 70. 710. PERSONAL AUTHOR (M) CORPORATE SOURCE (USA) PUB. DATE (YYMMDD) PRIMARY TITLE (M) NRDL-TR--170 Physical, chemical, and radiological properties, of slurry particulate fall-out collected during Operation Redwing Farlow, N.H.; Schell, Wr. Naval Radiological Defense Lab., San Francisco, CA 371. 570505 34. CLASSIF. LEVEL TEXT Unclassified 950. ABSTRACT The properties of individual fallout particles produced by nuclear detonations at zero height over Shallow sea water are analytically described for the first time. The particles produced during operation REDWING were slurry masses composed of water, dissolved and crystalline sea salts, and seawater-insoluble solids from the weapon, barge, and ocean floor. Special techniques were used to measure the chloride, water, and insoluble-solids content of individual slurry particles, Autoradiography showed that the activity is primarily associated with the solids. A table of experimental data 9003430 OFFICIAL USE ONLY